Nickel Alloy 90 (UNS N07090)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Applications

Introduction

Nickel Alloy 90 is a wrought nickel-chromium-cobalt base alloy strengthened with the additions of aluminum and titanium. It has been developed as an age-hardenable creep-resisting alloy for service at temperatures up to 920°C (1688°F). The alloy has good resistance to high-temperature corrosion and oxidation.

The following section will discuss in detail about nickel alloy 90.

Chemical Composition

The chemical composition of nickel alloy 90 is outlined in the following table.

Element Content (%)
Nickel, Ni 55
Chromium, Cr 18-21
Cobalt, Co 15-21
Titanium, Ti 2-3
Iron, Fe ≤1.5
Aluminum, Al 1-2
Manganese, Mn ≤1
Silicon, Si ≤1
Zirconium, Zr ≤0.15
Carbon, C ≤0.13
Boron, B ≤0.02

Physical Properties

The following table shows the physical properties of nickel alloy 90.

Properties Metric Imperial
Density 8.18 g/cm3 0.296 lb/in3
Melting point 1310-1370°C 2390-2500°F

Mechanical Properties

The mechanical properties of nickel alloy 90 are displayed in the following table.

Properties Metric Imperial
Tensile strength (precipitation hardened) 1150 MPa 167000 psi
Yield strength (precipitation hardened) 725 MPa 105000 psi
Elongation at break (precipitation hardened) 30% 30%

Thermal Properties

The thermal properties of nickel alloy 90 are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 12.7 µm/m°C 7.06 µin/in°F
Thermal conductivity 11.5 W/mK 79.8 BTU.in/hrft².°F

Other Designations

Other designations that are equivalent to nickel alloy 90 include the following:

  • BS 3075 (NA19)
  • BS HR202
  • BS HR402
  • BS HR501 - HR503
  • AMS 5829
  • AFNOR NCK 20 D
  • AECMA Pr EN 2295 – 2299
  • AECMA Pr EN 2400
  • AECMA Pr EN 2401
  • AECMA Pr EN 2412
  • AECMA Pr EN 2669
  • AECMA Pr EN 2670

Applications

The following are the list of applications of nickel alloy 90:

  • Blades and disks in gas turbines
  • Springs
  • Hot-working tools.

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